module teapo.storage.attached.indexedDB { 

  export class UpdateStorage implements attached.UpdateStorage { 

    constructor(private _db: IDBDatabase) { 

    }

    update(file: string, property: string, value: string, callback?: (error: Error) => void) {

      var transaction = this._db.transaction(['files', 'metadata'], 'readwrite');

      transaction.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'update: transaction'));

      var filesStore = transaction.objectStore('files');

      var getFile = filesStore.get(file);

      getFile.onsuccess = (event) => {

        var file: FileData = getFile.result || { path: file };

        file[property] = value;

        var putFile = filesStore.put(file);

        putFile.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'update: objectStore(files).get(' + file + ')-put('+property+','+value+')'));

        putFile.onsuccess = (event) => {

          var metadataStore = transaction.objectStore('metadata');

          var metadataData = { property: 'editedUTC', value: Date.now() };

          var putMetadata = metadataStore.put(metadataData);

          putMetadata.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'update: objectStore(files)/get/put-objectStore(metadata).put(editedUTC,' + metadataData.value+')'));

          putMetadata.onsuccess = (event) => callback(null);

        };

      };

    }

    remove(file: string, callback?: (error: Error) => void) { 

      callback(new Error('Not implemented.'));

    }

  }

}